1 /* 2 * thmc50.c - Part of lm_sensors, Linux kernel modules for hardware 3 * monitoring 4 * Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl> 5 * Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and 6 * Philip Edelbrock <phil@netroedge.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/slab.h> 26 #include <linux/i2c.h> 27 #include <linux/hwmon.h> 28 #include <linux/hwmon-sysfs.h> 29 #include <linux/err.h> 30 #include <linux/mutex.h> 31 #include <linux/jiffies.h> 32 33 MODULE_LICENSE("GPL"); 34 35 /* Addresses to scan */ 36 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 37 38 /* Insmod parameters */ 39 enum chips { thmc50, adm1022 }; 40 41 static unsigned short adm1022_temp3[16]; 42 static unsigned int adm1022_temp3_num; 43 module_param_array(adm1022_temp3, ushort, &adm1022_temp3_num, 0); 44 MODULE_PARM_DESC(adm1022_temp3, 45 "List of adapter,address pairs to enable 3rd temperature (ADM1022 only)"); 46 47 /* Many THMC50 constants specified below */ 48 49 /* The THMC50 registers */ 50 #define THMC50_REG_CONF 0x40 51 #define THMC50_REG_COMPANY_ID 0x3E 52 #define THMC50_REG_DIE_CODE 0x3F 53 #define THMC50_REG_ANALOG_OUT 0x19 54 /* 55 * The mirror status register cannot be used as 56 * reading it does not clear alarms. 57 */ 58 #define THMC50_REG_INTR 0x41 59 60 static const u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 }; 61 static const u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C }; 62 static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B }; 63 static const u8 THMC50_REG_TEMP_CRITICAL[] = { 0x13, 0x14, 0x14 }; 64 static const u8 THMC50_REG_TEMP_DEFAULT[] = { 0x17, 0x18, 0x18 }; 65 66 #define THMC50_REG_CONF_nFANOFF 0x20 67 #define THMC50_REG_CONF_PROGRAMMED 0x08 68 69 /* Each client has this additional data */ 70 struct thmc50_data { 71 struct i2c_client *client; 72 const struct attribute_group *groups[3]; 73 74 struct mutex update_lock; 75 enum chips type; 76 unsigned long last_updated; /* In jiffies */ 77 char has_temp3; /* !=0 if it is ADM1022 in temp3 mode */ 78 char valid; /* !=0 if following fields are valid */ 79 80 /* Register values */ 81 s8 temp_input[3]; 82 s8 temp_max[3]; 83 s8 temp_min[3]; 84 s8 temp_critical[3]; 85 u8 analog_out; 86 u8 alarms; 87 }; 88 89 static struct thmc50_data *thmc50_update_device(struct device *dev) 90 { 91 struct thmc50_data *data = dev_get_drvdata(dev); 92 struct i2c_client *client = data->client; 93 int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0); 94 95 mutex_lock(&data->update_lock); 96 97 if (time_after(jiffies, data->last_updated + timeout) 98 || !data->valid) { 99 100 int temps = data->has_temp3 ? 3 : 2; 101 int i; 102 int prog = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 103 104 prog &= THMC50_REG_CONF_PROGRAMMED; 105 106 for (i = 0; i < temps; i++) { 107 data->temp_input[i] = i2c_smbus_read_byte_data(client, 108 THMC50_REG_TEMP[i]); 109 data->temp_max[i] = i2c_smbus_read_byte_data(client, 110 THMC50_REG_TEMP_MAX[i]); 111 data->temp_min[i] = i2c_smbus_read_byte_data(client, 112 THMC50_REG_TEMP_MIN[i]); 113 data->temp_critical[i] = 114 i2c_smbus_read_byte_data(client, 115 prog ? THMC50_REG_TEMP_CRITICAL[i] 116 : THMC50_REG_TEMP_DEFAULT[i]); 117 } 118 data->analog_out = 119 i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT); 120 data->alarms = 121 i2c_smbus_read_byte_data(client, THMC50_REG_INTR); 122 data->last_updated = jiffies; 123 data->valid = 1; 124 } 125 126 mutex_unlock(&data->update_lock); 127 128 return data; 129 } 130 131 static ssize_t show_analog_out(struct device *dev, 132 struct device_attribute *attr, char *buf) 133 { 134 struct thmc50_data *data = thmc50_update_device(dev); 135 return sprintf(buf, "%d\n", data->analog_out); 136 } 137 138 static ssize_t set_analog_out(struct device *dev, 139 struct device_attribute *attr, 140 const char *buf, size_t count) 141 { 142 struct thmc50_data *data = dev_get_drvdata(dev); 143 struct i2c_client *client = data->client; 144 int config; 145 unsigned long tmp; 146 int err; 147 148 err = kstrtoul(buf, 10, &tmp); 149 if (err) 150 return err; 151 152 mutex_lock(&data->update_lock); 153 data->analog_out = clamp_val(tmp, 0, 255); 154 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT, 155 data->analog_out); 156 157 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 158 if (data->analog_out == 0) 159 config &= ~THMC50_REG_CONF_nFANOFF; 160 else 161 config |= THMC50_REG_CONF_nFANOFF; 162 i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config); 163 164 mutex_unlock(&data->update_lock); 165 return count; 166 } 167 168 /* There is only one PWM mode = DC */ 169 static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr, 170 char *buf) 171 { 172 return sprintf(buf, "0\n"); 173 } 174 175 /* Temperatures */ 176 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, 177 char *buf) 178 { 179 int nr = to_sensor_dev_attr(attr)->index; 180 struct thmc50_data *data = thmc50_update_device(dev); 181 return sprintf(buf, "%d\n", data->temp_input[nr] * 1000); 182 } 183 184 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr, 185 char *buf) 186 { 187 int nr = to_sensor_dev_attr(attr)->index; 188 struct thmc50_data *data = thmc50_update_device(dev); 189 return sprintf(buf, "%d\n", data->temp_min[nr] * 1000); 190 } 191 192 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr, 193 const char *buf, size_t count) 194 { 195 int nr = to_sensor_dev_attr(attr)->index; 196 struct thmc50_data *data = dev_get_drvdata(dev); 197 struct i2c_client *client = data->client; 198 long val; 199 int err; 200 201 err = kstrtol(buf, 10, &val); 202 if (err) 203 return err; 204 205 mutex_lock(&data->update_lock); 206 data->temp_min[nr] = clamp_val(val / 1000, -128, 127); 207 i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr], 208 data->temp_min[nr]); 209 mutex_unlock(&data->update_lock); 210 return count; 211 } 212 213 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr, 214 char *buf) 215 { 216 int nr = to_sensor_dev_attr(attr)->index; 217 struct thmc50_data *data = thmc50_update_device(dev); 218 return sprintf(buf, "%d\n", data->temp_max[nr] * 1000); 219 } 220 221 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr, 222 const char *buf, size_t count) 223 { 224 int nr = to_sensor_dev_attr(attr)->index; 225 struct thmc50_data *data = dev_get_drvdata(dev); 226 struct i2c_client *client = data->client; 227 long val; 228 int err; 229 230 err = kstrtol(buf, 10, &val); 231 if (err) 232 return err; 233 234 mutex_lock(&data->update_lock); 235 data->temp_max[nr] = clamp_val(val / 1000, -128, 127); 236 i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr], 237 data->temp_max[nr]); 238 mutex_unlock(&data->update_lock); 239 return count; 240 } 241 242 static ssize_t show_temp_critical(struct device *dev, 243 struct device_attribute *attr, 244 char *buf) 245 { 246 int nr = to_sensor_dev_attr(attr)->index; 247 struct thmc50_data *data = thmc50_update_device(dev); 248 return sprintf(buf, "%d\n", data->temp_critical[nr] * 1000); 249 } 250 251 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, 252 char *buf) 253 { 254 int index = to_sensor_dev_attr(attr)->index; 255 struct thmc50_data *data = thmc50_update_device(dev); 256 257 return sprintf(buf, "%u\n", (data->alarms >> index) & 1); 258 } 259 260 #define temp_reg(offset) \ 261 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp, \ 262 NULL, offset - 1); \ 263 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \ 264 show_temp_min, set_temp_min, offset - 1); \ 265 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \ 266 show_temp_max, set_temp_max, offset - 1); \ 267 static SENSOR_DEVICE_ATTR(temp##offset##_crit, S_IRUGO, \ 268 show_temp_critical, NULL, offset - 1); 269 270 temp_reg(1); 271 temp_reg(2); 272 temp_reg(3); 273 274 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0); 275 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5); 276 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 1); 277 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 7); 278 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2); 279 280 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out, 281 set_analog_out, 0); 282 static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0); 283 284 static struct attribute *thmc50_attributes[] = { 285 &sensor_dev_attr_temp1_max.dev_attr.attr, 286 &sensor_dev_attr_temp1_min.dev_attr.attr, 287 &sensor_dev_attr_temp1_input.dev_attr.attr, 288 &sensor_dev_attr_temp1_crit.dev_attr.attr, 289 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 290 &sensor_dev_attr_temp2_max.dev_attr.attr, 291 &sensor_dev_attr_temp2_min.dev_attr.attr, 292 &sensor_dev_attr_temp2_input.dev_attr.attr, 293 &sensor_dev_attr_temp2_crit.dev_attr.attr, 294 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 295 &sensor_dev_attr_temp2_fault.dev_attr.attr, 296 &sensor_dev_attr_pwm1.dev_attr.attr, 297 &sensor_dev_attr_pwm1_mode.dev_attr.attr, 298 NULL 299 }; 300 301 static const struct attribute_group thmc50_group = { 302 .attrs = thmc50_attributes, 303 }; 304 305 /* for ADM1022 3rd temperature mode */ 306 static struct attribute *temp3_attributes[] = { 307 &sensor_dev_attr_temp3_max.dev_attr.attr, 308 &sensor_dev_attr_temp3_min.dev_attr.attr, 309 &sensor_dev_attr_temp3_input.dev_attr.attr, 310 &sensor_dev_attr_temp3_crit.dev_attr.attr, 311 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 312 &sensor_dev_attr_temp3_fault.dev_attr.attr, 313 NULL 314 }; 315 316 static const struct attribute_group temp3_group = { 317 .attrs = temp3_attributes, 318 }; 319 320 /* Return 0 if detection is successful, -ENODEV otherwise */ 321 static int thmc50_detect(struct i2c_client *client, 322 struct i2c_board_info *info) 323 { 324 unsigned company; 325 unsigned revision; 326 unsigned config; 327 struct i2c_adapter *adapter = client->adapter; 328 const char *type_name; 329 330 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 331 pr_debug("thmc50: detect failed, smbus byte data not supported!\n"); 332 return -ENODEV; 333 } 334 335 pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n", 336 client->addr, i2c_adapter_id(client->adapter)); 337 338 company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID); 339 revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE); 340 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 341 if (revision < 0xc0 || (config & 0x10)) 342 return -ENODEV; 343 344 if (company == 0x41) { 345 int id = i2c_adapter_id(client->adapter); 346 int i; 347 348 type_name = "adm1022"; 349 for (i = 0; i + 1 < adm1022_temp3_num; i += 2) 350 if (adm1022_temp3[i] == id && 351 adm1022_temp3[i + 1] == client->addr) { 352 /* enable 2nd remote temp */ 353 config |= (1 << 7); 354 i2c_smbus_write_byte_data(client, 355 THMC50_REG_CONF, 356 config); 357 break; 358 } 359 } else if (company == 0x49) { 360 type_name = "thmc50"; 361 } else { 362 pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n"); 363 return -ENODEV; 364 } 365 366 pr_debug("thmc50: Detected %s (version %x, revision %x)\n", 367 type_name, (revision >> 4) - 0xc, revision & 0xf); 368 369 strlcpy(info->type, type_name, I2C_NAME_SIZE); 370 371 return 0; 372 } 373 374 static void thmc50_init_client(struct thmc50_data *data) 375 { 376 struct i2c_client *client = data->client; 377 int config; 378 379 data->analog_out = i2c_smbus_read_byte_data(client, 380 THMC50_REG_ANALOG_OUT); 381 /* set up to at least 1 */ 382 if (data->analog_out == 0) { 383 data->analog_out = 1; 384 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT, 385 data->analog_out); 386 } 387 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 388 config |= 0x1; /* start the chip if it is in standby mode */ 389 if (data->type == adm1022 && (config & (1 << 7))) 390 data->has_temp3 = 1; 391 i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config); 392 } 393 394 static int thmc50_probe(struct i2c_client *client, 395 const struct i2c_device_id *id) 396 { 397 struct device *dev = &client->dev; 398 struct thmc50_data *data; 399 struct device *hwmon_dev; 400 int idx = 0; 401 402 data = devm_kzalloc(dev, sizeof(struct thmc50_data), GFP_KERNEL); 403 if (!data) 404 return -ENOMEM; 405 406 data->client = client; 407 data->type = id->driver_data; 408 mutex_init(&data->update_lock); 409 410 thmc50_init_client(data); 411 412 /* sysfs hooks */ 413 data->groups[idx++] = &thmc50_group; 414 415 /* Register additional ADM1022 sysfs hooks */ 416 if (data->has_temp3) 417 data->groups[idx++] = &temp3_group; 418 419 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 420 data, data->groups); 421 return PTR_ERR_OR_ZERO(hwmon_dev); 422 } 423 424 static const struct i2c_device_id thmc50_id[] = { 425 { "adm1022", adm1022 }, 426 { "thmc50", thmc50 }, 427 { } 428 }; 429 MODULE_DEVICE_TABLE(i2c, thmc50_id); 430 431 static struct i2c_driver thmc50_driver = { 432 .class = I2C_CLASS_HWMON, 433 .driver = { 434 .name = "thmc50", 435 }, 436 .probe = thmc50_probe, 437 .id_table = thmc50_id, 438 .detect = thmc50_detect, 439 .address_list = normal_i2c, 440 }; 441 442 module_i2c_driver(thmc50_driver); 443 444 MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>"); 445 MODULE_DESCRIPTION("THMC50 driver"); 446